X(a+b)-y(a+b)
*factor out (a+b)*
=(a+b)(x-y)
Answer:
d
Step-by-step explanation:
It might be 31 if you add all the numbers together but I'm not positive.
Attached is the solution.
The following log properties are used:

117
Step-by-step explanation:
(x+3) is 13 because x is 10 so 10+3 is 13 and then 9 so 13×9 is 117